Spring-loaded for easy adjustment Underdesk pullout keyboard drawer offers 3 types of adjustment. Adjusts up to 12.75in. in height, tilts +/-15degrees and swivels 360degrees. Spring-assisted keyboard arm provides easy adjustment. Simply lift to desired height and release - no knobs! Mousing surface attaches on right or left side. Adjusts 2in. above or 2in. below the keyboard platform, tilts +/-15degrees and swivels 270degrees. The gel wrist pad offers comfortable typing support.